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Net loss per share - Numerator and Denominator (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator        
Net loss $ (118,370) $ (181,427) $ (247,012) $ (294,114)
Denominator        
Denominator for basic and diluted net loss per share (in shares) 70,414,632 65,150,780 70,302,241 63,769,958
Net loss per share:        
Basic and diluted (in dollars per share) $ (1.68) $ (2.78) $ (3.51) $ (4.61)